Gemstone



FIG. 1 is a top/side perspective view of a gemstone having the design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation view, the opposite side elevation view being a mirror image thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a back end elevation view thereof; and,

FIG. 6 is a front end elevation view thereof. 

The ornamental design for a gemstone, as shown and described. 